I've been dual wielding hand crossbows for an Act or so and it's been going very well thus far. The quivers and crossbows/bows I've come across so far haven't enticed me to switch and my good shield went on my Templar.

I find a number of blue/yellow hand crossbows now and again and I like the comparison to my current weapon.

Is there a way to have it compare to the off hand weapon instead? Or the lesser of the two equipped weapons?

Alternately would there be a serious disadvantage to putting my best weapon in my off hand and the lesser in the main slot?